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Yes the Surfing Physics space book is excellent, it has a range of Projectile questions.

"Gather and process information to interpret the results of the Michaelson-Morely Experiment" I don' think we touched on it at school. And I can't seem to understand what they expect. Thanks in advance.

Ok thanks. Is that something you simply think of on sight of this question, or it is a method expected to be known???

But Im after Cos(theta) to the power of 7 not cos(7theta)

Yes. But without the minusses, just plusses throughout i.e. cos7A=(cos 7A+7cos 5A+21cos 3A+35cos A)/64 How and why?

well not necesarily do it. Just a brief explanantion on how to approach it/ and how would you know how to approach it.

Yes!!! Thanks!!!

Express Cos^7(theta) [i.e. Cos theta to the power of 7] in terms of cosines of multiples of theta. The text book goes through a solution, although it doesnt really explain the reason for the approach. Or is this just one of those questions where that you MUST have done before to realise...

Yer lol, but you don't have to bother with 2 unit circles

Yes. But the chapter in book two is all to do with parametrics...

The only exception I think would be for a circle with centre other than the origin. In that case you don't need x/y intercepts, just centre, and a point indicating the radius.

Ever Heard of 50% of your final HSC mark comes from assessments?

The most common flaw of the HSC. The board of studies chooses to count asessments to contribute to 50% of the final HSC mark; yet we have schools like this giving people an unfair advantage... Telling people "clues" or "hints" on a test, allowing them to bring in a sheet: FOR MATHS...

Thanks. I figured It'd be 0. But it seemed weired for a 4 mark question to come out so nicely =\

How would you go about putting this question??? http://link.imgshare.us/b1b3xp (sorry about the large image)

If p-1 = 1+pq, and S is the point represented by (ap + aq, apq), FInd the equation of the locus of S.... S is the intersection of two tangents on the parabola x^2 = 4ay, from pint P(2ap, ap^2) and Q(2aq,aq^2) Im Getting x^2 = y^2 + 6ay + a^2

OK. But we havnt learnt to differnetiate sine and cos. So basically my question is. Find dy/dx for x^2 + y^2 = 4 (That is after you turn them into a parametric). By the way, does the final derivative have to be with respect to x only or it could be x and y??

Find dy/dx if: x=2cos(Theta) y=2sin(Theta) Im getting dy/dx = +-x/[{root}(4-x^2)] Doesn't seam too right =\ Please help. Thanks.

Yep, Im 100% sure you can do this, Basically there are 3 ways to prove a quadrilateral is a cyclic quad: i) Angles in the same segment standing off the same arc are equal, therefore points of arc and subtended to form a cyclic quad (your situation) ii) Opposite angles of a cyclic quad are...